package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    @Override
    public User login(UserLoginDTO userLoginDTO) {
        //获取openid
        String openid = getOpenid(userLoginDTO);

        if(openid==null ||"".equals(openid)){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否是新用户？？
        User user = userMapper.selectByOpenId(openid);

        if(user==null){
            //当前登录的用户是一个新用户
            //insert into user () values()
            user = User.builder()
                     .openid(openid)
                     .createTime(LocalDateTime.now())
                     .build();

             userMapper.insert(user);
        }

        return user;
    }

    private String getOpenid(UserLoginDTO userLoginDTO) {
        //1.发送请求访问微信服务，获取登录凭证openid
        String code = userLoginDTO.getCode();
        if(code==null||"".equals(code)){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String response = HttpClientUtil.doGet("https://api.weixin.qq.com/sns/jscode2session", map);

        JSONObject jsonObject = JSON.parseObject(response);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
